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How to read whole file in Ruby?

Posted by: admin November 30, 2017 Leave a comment

Questions:

Is there an in-built function in Ruby to read the whole file without using any loop? So far, I have only come across methods that read in chunks (line or character).

Answers:
IO.read("filename")

or

File.read("filename")

Questions:
Answers:
File.readlines("filename")

This is also a great method to read everything from a file and break split on carriage returns. The return is an Array with one line per element.

Questions:
Answers:

Please ignore advice which states “You should never slurp (which is the annoying term for this) a file”. Sometimes this is a very useful, and sensible thing to do.

Suppose you’re reading a file repeatedly : good chance that reading the file into an array is a sensible optimisation over reading the file line by line, even taking into account that the o/s will cache the file.